In this section, we will learn about the equation of circles in standard form.[br][br][center][math]\left(x-h\right)^2+\left(y-k\right)^2=r^2[/math][/center]In the applet below, play around with the sliders h, k, and r. [br]Observe how each of these variables control different aspects of the circle.
What does the variable h in [math]\left(x-h\right)^2+\left(y-k\right)^2=r^2[/math] control?
What does the variable k in [math]\left(x-h\right)^2+\left(y-k\right)^2=r^2[/math] control?
What does the variable r in [math]\left(x-h\right)^2+\left(y-k\right)^2=r^2[/math] control?